1. GERDA Collaboration Meeting,
TG-10 status report
Kevin Kröninger
on behalf of the TG-10
Max-Planck-Institut für Physik, München
GERDA Collaboration Meeting,
Ringberg Castle, –

2. Majorana / GERDA Joint Monte Carlo Workshop Your input is needed
Overview
Completed projects
Ongoing projects
Future projects
Majorana / GERDA Joint Monte Carlo Workshop
Your input is needed
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

3. Recently completed projects
Placement of PMTs for the muon veto Tübingen
Validation of MaGe with test stand data (gammas) Munich
Studies of the angular correlation between gammas in Co-60 Munich
Installation of MaGe in Heidelberg Heidelberg
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

4. (GERDA) MaGe update all
Ongoing projects
(GERDA) MaGe update all
Validation of MaGe with test stand data (neutrons) Washington/Munich
MaGe reference paper all
Easy geometry implementation LNGS
Muon veto efficiency Tübingen
Calculation of radioactivity limits for Phase I Moscow
MaGe documentation Washington/Munich
Bench mark processes Washington/Munich
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

5. Ongoing projects: MaGe Update
Geometry:
Infrastructure → Beams, clean room, lock, ...
Water tank → final geometry needed
Cryostat → final geometry needed
Detectors → Phase I detector geometries needed (database?)
→ Define reference arrays (Phase I and II)
→ Drawings accessible to TG 10? → Materials (and thus activities) fixed yet?
Physics lists, technical details
Documentation:
MaGe user‘s and developer‘s guide
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

6. Ongoing projects: Validation with test stand data (neutrons)
Data taken with an 18-fold segmented detector and an AmBe source
Identification of lines is ongoing
MC plus background describes most of the features in the spectrum
Some lines are not described in GEANT4 (meta-stable states)
Work with neutron data also performed by Majorana
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

7. Ongoing projects: MaGe reference publication
Aim: MaGe reference
Together with Majorana MC group
GERDA participation: Tübingen, LNGS, Munich
Topics:
Scope (double-beta decay and related)
Structure of MaGe (flexibility)
Physics validation
Journal: IEEE
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

8. Ongoing projects: Easy geometry implementation
Triggered by material screening group
New feature: define materials and (simple) geometries from external file, i.e. no re-compiling necessary.
New feature: new output scheme for detector efficiency calculation
Manual and test macros available (CVS)
Test of GDML (more general database) planned
Further details in the MaGe Workshop
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

9. Ongoing projects: Muon veto efficiency
Calculation of the muon veto efficiency ongoing
Efficiency of 98.9% obtained with Cherencov detector alone
Data base of dangerous muons is being build up
Geometry of scintillator plates to be updated during general MaGe update
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

10. Ongoing projects: Calculation of radioactivity limits for Phase I
Calculation of background from suspension and crystals for Phase I
Assumptions: 9 Phase I crystals liquid Argon Anti-coincidence analysis
Allowed activities A for 10-3 counts/(kg·keV·y):
Part
Mass [kg]
A(238U) [μBq/kg]
A(228Th) [μBq/kg]
Crystals
18.0
0.13
0.4
Argon
1.8
Holder
1.1
55.6
10.1
Electronics
0.6
≈8000
≈500
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

11. Monte Carlo campaign with updated geometry:
Planned projects
Monte Carlo campaign with updated geometry:
Estimate of expected background
Signal efficiencies for physics processes (0νββ, 2νββ, ...)
→ Major effort in the next months
→ Create reference background table for GERDA
Pulse shape simulation:
Extra software package with interface to MaGe
Development together with Majorana MC group
Simulation of test stands and auxiliary experiments:
Monte Carlo validation
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

12. Joint Majorana / GERDA Monte Carlo Workshop on MaGe
MaGe Workshop
Joint Majorana / GERDA Monte Carlo Workshop on MaGe
Majorana and Gerda participation (about 25 participants)
Monte Carlo validation – Data to Monte Carlo comparisons
Technical issues (code design and development, organization, release policy, ...) and documentation
User‘s input
Discussion of development of pulse shape simulation
MaGe ↔ GEANT4 ↔ ILIAS connections
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –

13. If you did work related to Monte Carlo please let TG-10 know.
Your input is needed
If you did work related to Monte Carlo please let TG-10 know.
Communication is improvable, please help
We would like to have input from users:
Do you have problems running MaGe, let us know.
Are there features which you´d like to see in MaGe, let us know.
Are there any changes in the hardware design, let us know.
Is there data which does/does not agree with MC, let us know.
Kevin Kröninger GERDA Collaboration Meeting, Ringberg Castle –